CN101852613B - Light transceiving integrated device applied to fiber sensing - Google Patents
Light transceiving integrated device applied to fiber sensing Download PDFInfo
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- CN101852613B CN101852613B CN2010101549056A CN201010154905A CN101852613B CN 101852613 B CN101852613 B CN 101852613B CN 2010101549056 A CN2010101549056 A CN 2010101549056A CN 201010154905 A CN201010154905 A CN 201010154905A CN 101852613 B CN101852613 B CN 101852613B
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Abstract
The embodiment of the invention provides a light transceiving integrated device applied to fiber sensing. The light transceiving integrated device comprises a light source, a photoelectric detector, a polarizing beam splitter, a half-wave plate, a Faraday rotator, a reflector and a lens, wherein the polarization state of emergent light emitted by the light source is regulated through the half-wave plate and the Faraday rotator so that the emergent light is changed between parallel transmission light and vertical reflected light; and the emergent light after the polarizing regulation enters tail fibers of polarization maintaining fibers through the polarizing beam splitter, the reflector and the lens, and the emergent light is received through the photoelectric detector and returned from an interferometer sensor. The structure and the light path process can realize integration and encapsulation of discrete components in a single module, reduce the fiber welding point number in a fiber gyro system, eliminate the 6db inherent loss in the conventional system, and improve the reciprocity and stability of a fiber gyro.
Description
Technical field
The present invention relates to sensory field of optic fibre, relate in particular to a kind of light transceiving integrated device that is applied to Fibre Optical Sensor.
Background technology
At present; The fiber optic gyro (FOG) miniaturization technology is the new and high technology that a lot of in the world countries, scientific research institution chase; The miniaturization technology of fibre optic gyroscope mainly is the integrated optics type FOG of compact conformation in the prior art; And as with the light source of the type FOG, detector, coupling mechanism and connect that the integrated gordian technique of light path height---transceiving integrated module has become the key of FOG miniaturization naturally.
In the prior art; Light source among the FOG and detector generally are the light inputs and output that realizes the Sagnac interferometer through 2 * 2 fiber couplers; But this technical scheme exists the inherent loss of 6db; And this traditional optical transceiver structure also caused the volume of light transmitting and receiving device excessive, is difficult to realize the miniaturization of fibre optic gyroscope.
Summary of the invention
The embodiment of the invention provides a kind of light transceiving integrated device that is applied to Fibre Optical Sensor, can be encapsulated in the single module each discrete component is integrated, makes the miniaturization of fibre optic gyroscope become possibility; Simultaneously can reduce the fused fiber splice number of spots in the optical fibre gyro system, improve optical coupling efficiency, and can eliminate the 6db inherent loss that exists in the existing system, improve the reciprocity and the stability of fibre optic gyroscope.
The embodiment of the invention provides a kind of light transceiving integrated device that is applied to Fibre Optical Sensor, and said device comprises light source, photodetector, polarization beam apparatus, half-wave plate, Faraday rotator, catoptron and lens, wherein:
Through said half-wave plate and Faraday rotator, the outgoing polarization state of light that said light source sends is adjusted, it is changed between parallel transmitted light and vertical reflection light;
And through polarization beam apparatus, catoptron and lens, make the adjusted emergent light of polarization enter into polarization maintaining fiber pigtail, and receive the emergent light after returning from interferometer sensor through said photodetector.
Said Faraday rotator can rotate 45 degree with incident polarized light, and the optical axis of said half-wave plate becomes 22.5 degree angles with perpendicular light polarization directions.
Said polarization beam apparatus, catoptron and the lens of passing through make the adjusted emergent light of polarization enter into polarization maintaining fiber pigtail, specifically comprise:
The emergent light that said light source sends incides said polarization beam apparatus through behind the lens;
Said polarization beam apparatus is divided into parallel transmitted light and vertical reflection light with this emergent light; And respectively through getting into another polarization beam apparatus behind said Faraday rotator, the said half-wave plate, by entering into polarization maintaining fiber pigtail through another lens after this another polarization beam apparatus outgoing.
Saidly receive the emergent light after returning from interferometer sensor, specifically comprise through said photodetector:
Emergent light after returning from said interferometer sensor is divided into parallel transmitted light and vertical reflection light accordingly through behind said another polarization beam apparatus, and carries out polarization manipulation through said half-wave plate, said Faraday rotator respectively;
Emergent light after this polarization manipulation through after said polarization beam apparatus transmission or the reflection, is received by said photodetector again.
The embodiment of the invention also provides a kind of light transceiving integrated device that is applied to Fibre Optical Sensor, and said device comprises light source, photodetector, polarization beam splitter prism, the gyrotropi crystal that has magnet ring and lens, wherein:
When said light source is selected high polarisation source for use; With said light source rotation adjustment; Make the polarization direction of its emergent light identical with the polarization principal axis of said polarization beam splitter prism; The emergent light that said light source sends passes through said polarization beam splitter prism through transmission behind the said lens, and gets into the said gyrotropi crystal that has magnet ring, makes rotation 45 degree backs in polarization direction enter into polarization maintaining fiber pigtail through the focusing of one of lenses;
When said light source is selected low polarisation source for use; The horizontal direction polarized light that said light source sends passes through said polarization beam splitter prism through transmission behind the said lens; And get into the said gyrotropi crystal that has magnet ring, make the back focusing of polarization direction rotation 45 degree of this horizontal direction polarized light enter into polarization maintaining fiber pigtail through one of lenses.
Said enter into polarization maintaining fiber pigtail after, the light backpropagation of returning, and, become the vertically reflected light of polarization through rotation 45 degree behind the said gyrotropi crystal that has a magnet ring;
This vertically the reflected light of polarization and after converging by another lens, received through the reflection of said polarization beam splitter prism by said photodetector.
Light path part and the unified integrated encapsulation of circuit part with said light transceiving integrated device utilize Wire Bonding Technology to form a standard packaging form.
Can find out by the above-mentioned technical scheme that provides; The described light transceiving integrated device of the embodiment of the invention comprises light source, photodetector, polarization beam apparatus, half-wave plate, Faraday rotator, catoptron and lens; Wherein through said half-wave plate and Faraday rotator; Outgoing polarization state of light to said light source sends is adjusted, and it is changed between parallel transmitted light and vertical reflection light; And through polarization beam apparatus, catoptron and lens, make the adjusted emergent light of polarization enter into polarization maintaining fiber pigtail, and receive the emergent light after returning from interferometer sensor through said photodetector.Through above-mentioned structure and light path process, just can realize being encapsulated in the single module each discrete component is integrated, make the miniaturization of fibre optic gyroscope become possibility; Simultaneously can reduce the fused fiber splice number of spots in the optical fibre gyro system, improve optical coupling efficiency, and can eliminate the 6db inherent loss that exists in the existing system, improve the reciprocity and the stability of fibre optic gyroscope.
Description of drawings
Fig. 1 is a kind of structural representation of the said light transceiving integrated device of the embodiment of the invention;
Fig. 2 is the another kind of structural representation of the said light transceiving integrated device of the embodiment of the invention;
Fig. 3 is the contour structures synoptic diagram of packaged type that the embodiment of the invention provides.
Embodiment
The embodiment of the invention provides a kind of light transceiving integrated device that is applied to Fibre Optical Sensor, can realize being encapsulated in the single module each discrete component is integrated, makes the miniaturization of fibre optic gyroscope become possibility; Simultaneously can reduce the fused fiber splice number of spots in the optical fibre gyro system, improve optical coupling efficiency, and can eliminate the 6db inherent loss that exists in the existing system, improve the reciprocity and the stability of fibre optic gyroscope.
For better describing embodiment of the present invention; Combine accompanying drawing that specific embodiment of the present invention is described at present; Be illustrated in figure 1 as a kind of structural representation of the said light transceiving integrated device of the embodiment of the invention; Comprise light source (SLD), photodetector, polarization beam apparatus 1 and 2, half-wave plate, Faraday rotator, catoptron and lens among Fig. 1, lens comprise two kinds of convergent lens and collimation lenses, wherein:
Faraday rotator can rotate 45 degree with incident polarized light, and the optical axis of half-wave plate becomes 22.5 degree angles with perpendicular light polarization directions, make polarized light rotate 45 degree again, so just can realize the conversion of polarized light between horizontal polarization and vertical polarization.
In said structure, through said half-wave plate and Faraday rotator, the outgoing polarization state of light that said light source sends is adjusted, it is changed between parallel transmitted light and vertical reflection light; And, make the adjusted emergent light of polarization enter into polarization maintaining fiber pigtail through polarization beam apparatus 1 and 2, catoptron and lens, the emergent light after returning from interferometer sensor through the photodetector reception again.
In concrete implementation procedure, behind the emergent light process lens that at first light source sends, incide said polarization beam apparatus, i.e. polarization beam apparatus among Fig. 11; This polarization beam apparatus is divided into parallel transmitted light and vertical reflection light with this emergent light, and respectively through getting into another polarization beam apparatus, i.e. polarization beam apparatus among Fig. 12 behind Faraday rotator, the half-wave plate; By entering into polarization maintaining fiber pigtail through another lens after this another polarization beam apparatus outgoing.
Then, the emergent light after returning from interferometer sensor is divided into parallel transmitted light and vertical reflection light accordingly through behind the above-mentioned polarization beam apparatus 2, and carries out polarization manipulation through said half-wave plate, said Faraday rotator respectively; Emergent light after this polarization manipulation is received by said photodetector after passing through the transmission or reflection of polarization beam apparatus 1 again.
For instance, above-mentioned concrete implementation procedure is following, as shown in Figure 1: the SLD emergent light incides polarization beam apparatus 1 through micro collimating lens, is divided into vertical P reflected light and parallel S transmitted light; The P light component is through 45 ° of Faraday rotator rear polarizer direction rotations, again through half-wave plate, gets into polarization beam apparatus 2 and transmission after becoming S light, and transmission S light gets into polarization maintaining fiber pigtail through behind the convergent lens.Again see through polarization beam apparatus 2 after this S light returns from the Sagnac interferometer sensor, through 45 ° of half-wave plate polarization direction rotations, and once more through behind the Faraday rotator still for after the S transmittance goes out polarization beam apparatus 1, received by photodetector.
In like manner, the S light component that above-mentioned SLD light source sends is reflected by polarization beam apparatus 2 through becoming P light behind Faraday rotator and the half-wave plate, and gets into polarization maintaining fiber pigtail through behind the convergent lens after polarization beam apparatus 1 transmission.Again by polarization beam apparatus 2 reflections, become P light behind process half-wave plate and the Faraday rotator respectively once more after this P light returns from the Sagnac interferometer sensor, and, received by photodetector by after polarization beam apparatus 1 reflection.
Because said structure need not adopt 2 * 2 fiber couplers of R-T unit in the prior art, just can realize being encapsulated in the single module each discrete component is integrated, make the miniaturization of fibre optic gyroscope become possibility; Simultaneously can reduce the fused fiber splice number of spots in the optical fibre gyro system, improve optical coupling efficiency, and can successfully eliminate the 6db inherent loss that exists owing to 2 * 2 fiber couplers, improve the reciprocity and the stability of fibre optic gyroscope.
In addition; The embodiment of the invention also provides the another kind of light transceiving integrated device that is applied to Fibre Optical Sensor; Be illustrated in figure 2 as the another kind of structural representation of the said light transceiving integrated device of the embodiment of the invention; Comprise light source SLD, photodetector, polarization beam splitter prism PBS among Fig. 2, have the gyrotropi crystal OAC of magnet ring, and non-spherical lens L1, L2 and L3, wherein:
When light source SLD selects high polarisation source for use; Can be with said light source rotation adjustment; Make the polarization direction of its emergent light identical with the polarization principal axis of said polarization beam splitter prism PBS; Just can transmission pass through polarization beam splitter prism PBS behind the emergent light process lens L1 that light source sends like this, and get into the said gyrotropi crystal OAC that has magnet ring, make rotation 45 degree backs in polarization direction enter into polarization maintaining fiber pigtail through the focusing of one of lenses L2.Here, because the whole transmissions of light that light source sends, the light that returns afterwards all reflects, thereby can improve the energy of light source utilization factor.
And when light source SLD selects low polarisation source for use; Can transmission pass through polarization beam splitter prism PBS behind the horizontal direction polarized light process lens L1 that light source sends; And get into the gyrotropi crystal OAC have magnet ring, make behind polarization direction rotation 45 degree of this horizontal direction polarized light again focusing enter into polarization maintaining fiber pigtail through one of lenses L2.Here because what see through is the horizontal direction polarized light, reflection be vertical direction horizontal polarization light, like this loss half the power, but reduced the step that light source is adjusted simultaneously.
Simultaneously, after above-mentioned light enters into polarization maintaining fiber pigtail, the light backpropagation that it returns, and, become the vertically reflected light of polarization through rotation 45 degree behind the said gyrotropi crystal OAC that has a magnet ring; Then this vertically the reflected light of polarization and converge the back by another lens L3 and received through reflection of said polarization beam splitter prism PBS by photodetector.
For instance, the concrete realization of said process can be the polarization direction along continuous straight runs of the SLD emergent light of 1310nm wavelength (be paper plane, can be designated as parallel S transmitted light), and through becoming collimated light beam behind the non-spherical lens L1, spot diameter is about 0.5mm; This S polarization parallel light beam can get into the Farady gyrotropi crystal (OAC) that has magnet ring through polarization beam splitter prism PBS, and outgoing rear polarizer direction will be rotated 45 °; Get into second non-spherical lens L2 then, the focusing of process lens gets into the tail optical fiber of polarization maintaining optical fibre, and is adjusted into along its slow-axis direction, thereby has accomplished the forward-propagating of light.
This light that returns backpropagation again; Rotate 45 ° again through gyrotropi crystal OAC rear polarizer direction; Thereby backward beam polarization direction vertical with paper (can be designated as vertical P reflected light), after this P polarization orthogonal light beam reflected through polarization beam splitter prism PBS, L3 converged by non-spherical lens; And projecting on the PIN photosurface of photodetector, thereby the transmission-receiving function of completion entire device.
Same, because said structure need not adopt 2 * 2 fiber couplers of R-T unit in the prior art, just can realize being encapsulated in the single module each discrete component is integrated, make the miniaturization of fibre optic gyroscope become possibility; Simultaneously can reduce the fused fiber splice number of spots in the optical fibre gyro system, improve optical coupling efficiency, and can successfully eliminate the 6db inherent loss that exists owing to 2 * 2 fiber couplers, improve the reciprocity and the stability of fibre optic gyroscope.
In addition; Can also be with the light path part and the unified integrated encapsulation of circuit part of above-mentioned light transceiving integrated device; And utilize Wire Bonding Technology to form a standard packaging form, be illustrated in figure 3 as the contour structures synoptic diagram of packaged type that the embodiment of the invention provides.
Specifically can utilize micro-system encapsulation integrated technology; Be driving circuit and the temperature control circuit part of multi-chip module (MCM) fabrication techniques SLD, the protection chip does not receive or receives less the influence of external environment, and a good operation condition is provided for it; So that integrated component has stable, normal function; The mode of above-mentioned integrated encapsulation can encapsulate the light path part and the circuit part of whole module, reduces the influence of environment to transceiver module, is of value to the environmental suitability that improves gyro.
In sum, the embodiment of the invention can realize being encapsulated in the single module each discrete component is integrated, makes the miniaturization of fibre optic gyroscope become possibility; Simultaneously can reduce the fused fiber splice number of spots in the optical fibre gyro system, improve optical coupling efficiency, and can eliminate the 6db inherent loss that exists in the existing system, improve the reciprocity and the stability of fibre optic gyroscope.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101549056A CN101852613B (en) | 2010-04-20 | 2010-04-20 | Light transceiving integrated device applied to fiber sensing |
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| CN2010101549056A CN101852613B (en) | 2010-04-20 | 2010-04-20 | Light transceiving integrated device applied to fiber sensing |
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| CN101852613B true CN101852613B (en) | 2012-06-20 |
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Cited By (1)
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| CN2427935Y (en) * | 2000-05-12 | 2001-04-25 | 甘志银 | Integrated transmitting/receiver type single optical fiber two direction transmission modular |
| US7073269B2 (en) * | 2004-10-19 | 2006-07-11 | Trimble Navigation Limited | Self-leveling laser alignment tool and method thereof |
| CN201110904Y (en) * | 2007-09-14 | 2008-09-03 | 北京千禧恒业科技有限公司 | Dual wavelength single fiber bidirectional transmit-receive integrated active device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247271A (en) * | 2017-06-29 | 2017-10-13 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | A kind of aperture laser range finder altogether |
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